Lock.



PATBNTED JUNE 7, 1904.

I H. HARTMAN.

' LOCK.

APPLIoA-TION FILED M1143, 1994. N-o .-nonm..

vUNITED STATES Patented June 7, 1904.

PATENT OFFICE.

LOCK.

SPECIFICATION forming part oi' Letters Patent No. 762,051, dated June '7, 1904.

i Application filed January 13, 1904. Serial No. 188.857. (No model.)

T0 all whom it may concern:

parts, to be hereinafter more fully describech and specifically pointed out in the claims.

In describing theinvention in detail reference is had to the accompanying drawings, forming a part of thisl application, and wherein like numerals of reference indicate like parts throughout the several views, in which- Figure 1 is a plan view, with one Yside plate of the lock removed. Fig. 2 is a detail plan View of the tumbler. Fig. 3 is a top plan view. Fig. 4 is a side elevation of the key, a portion thereof being broken off. Fig. 5 is aplan view of the latch and lock bolt and the plate carried thereby. Fig. 6 is a top plan View thereof. Fig. 7 is a plan view of my improved lock similar to Fig. 1, showing the same in an unlocked position. Fig. 8 is a detail perspective view of a portion of the bellcrank lever employed` in my improved lock.

In carrying out my invention I provide a face-plate, which is adapted to be countersunk in the edge of the door or other object, and attached to the inner face of this plate is the lock-casing, comprisinga side plate 2, having integral iianges 3, and `adapted to be secured on these flanges by any suitable means is the ordinary sideplate. (Not shown.) The side plate 2 is provided with the ordinary keyhole 4 to admit the ward 5 of the key 6. The combined lock and latch bolt comprising a head 7, which operates in an opening provided therefor in the face-plate, this head being provided with a suitable beveled face 8 to cause the same to be depressed by its engagement with the door-jamb or strike-plate in the usual manner.

edge the V-shaped notch 19 and the semicir:

cular notch 20,-the object of which will be hereinafter more fully described. The tumbler 17, which is secured on this plate 12, is provided on itsrouter end with lugs or projections 21 22, and near its inner end the tumbler is provided with a pair of slots 23 and 24,which are cut on an arc, and connecting said slots centrally thereof is a slot 25, and projecting from the slot 24, near its upper edge, I provide a slot 26. In the lower edge of this tumbler, which is beveled, as indicated at 27, I provide a cut-away portion 28 and another cut-away portion 29. This tumbler also carries a pin 30, to which is attached a spring 31, the other end of this spring being` attached, as indicated at 32, to the long arm 33 of the bell-crank lever 34, this lever being pivoted to the side 2 of the casing, as indicated at 35, and the short arm 36 has formed in its lower end a notch 37, which on its under face is cut away, as indicated at 38, whereby when the same is moved access is given thereto for the spring 31, carried between the tumbler and the long arm of the bell-crank lever. Formed integral with the side plate 2 of the casing is thc ward 39, which is adapted to operate in the slots 18, 23,24, 25, and 26 of the plate and tumbler, respectively, and also carried by this plate 2 of the casing is the hub-shaft 40, having a square'aperture 41 therein to receive the knob-shaft, and on this hub is provided the arms 42, which are adapted to engage the long arm of the bell-crank lever when it is desired to operate the same. My improvement therefore residesv in the bell-crank lever 34, cooperating tumbler 17, and coil-spring 3/, the former two being related, first, by reason of the lug 22 of the tumbler extending into the bifurcation of the arm 36 of the lever 34, and, secondly, being related by means of spring 31, attachedto the tumbler and the remaining arm of the lever, enabling said spring to actuate both the bell-crank lever and the tumbler.

As illustrated in Fig. 1 of the drawings, the lock-bolt and latch-bolt is in a locked position, and the ward 39 engages in the upper part of the slot 23, also in the slot 18 of the plate beneath it. When the lock is in this position, it is impossible to withdraw the lockbolt by operating the knob, and when the key is inserted in the keyhole and rotated the ward of the key engages the notch 20 of the plate 12, and the ward 5 of the key raises the tumbler, disengaging the lug 21 from the slot 37 of the bell-crank lever, and at the same time forces the plate l2 outwardly, the ward 39 traveling' through the slot 25 into the upper part of the slot 24, assuming the position shown in Fig. 7 of the drawings, wherein the lug 22 has engaged in the slot 37 or notch formed in the end of the bell-crank lever 34. WVhen in this position, the door is unlocked and ready to be unlatched, at which time the same may be accomplished by either turning the knob, in which case the bell-crank lever is swung on its pivot and the tumbler 17 and the plate 12 travel rearwardly, the ward 39 traveling to the front part of the slot 26 and the front part of the slot 18, or the door may be unlatchcd by further rotating the key until the same engages in the notch 19 of the plate 12 and the cut-away portion 28 ot' the tumbler, at which time they are forced.

Having fully described my invention, what l claim as new, and desire to secure by Letters Patent, is-

1. In a lock, a bolt-head, having a slotted plate connected thereto, a tumbler pivoted to said plate and formed with a longitudinal opening to aline with said plate-slot and with a pair of spaced arc-like slots connected by a slot 25, extending into said longitudinal opening, a stud to be received in said slots of the tumbler and the plate-slot, a pair of lugs on the outer end of the tumbler, a bell-crank lever having one of its arms notched to receive said lugs, and a coil-spring connected to said lever and to said tumbler.

2. In a lock, a bolt-head having a plate connected thereto, a tumbler pivoted to the plate, said tumbler and plate having alining slots, a stud received in said slots, lugs on the tumbler, a bell-crank lever having its depending leg notched to receive one of said lugs, and a spring secured to the other leg of 'the bellcrank and to said tumbler.

In testimony whereof I affix my signature in the presence of two witnesses.

HENRY HARTMAN.

/Vitnesses:

H. C. EvER'r, WM. C. HEITZ. 

